I don't know why this company is increasing their forest capacities but it is not out of benevolence.
Regardless of their motivations, the effect of their actions is a general increase of forest lands. You mentioned "maintaining forests," I pointed out that someone is going beyond maintaining.
Once fire wood demand increases further they have an incentive to cut down their forests.
The company I referred to will be cutting down their forest in time, trees are a crop just like grain or strawberries. And after they cut them down, they will plant new ones.
Horatio83, while older trees store more carbon, younger trees absorb more carbon. Weyerhaeuser's (non-altruistic) actions of repeatedly cutting and planting is removing carbon from the atmosphere. The company isn't in the firewood business (I'm sure some gets burned), they're a lumber company, houses and other buildings that are built of wood are repositories of collected carbon. The only way that carbon will be immediately released is if the house burns down.
If Weyerhaeuser simply allowed the forest to remain untouched, the process of carbon removal would slow as the trees reached maturity. But the immature trees (again) "suck up" more carbon than their elders.
In theory you'd need a worldwide subsidy system for maintaining forests.
No, you need private "sustainable forest management." It sounds like you're advocating using tax money to do what private industry can do better, and provide thousands of jobs, and make a nice profit in the process.
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